Side-by-side tax comparison between Montana (5.65% top rate, graduated) and Washington (no income tax). See which state lets you keep more at every salary level, and how cost of living changes the picture.
Washington has no state income tax, while Montana uses a graduated system with rates of 4.7-5.65%. On a $100K salary, this creates a state tax difference of $3,673/year that Washington residents simply don’t pay.
Montana’s graduated brackets mean the gap between these two states widens at higher salaries. At $200K, the state tax difference grows to $7,345/year, while at $50K it’s only $1,836.
Washington wins at 10 out of 10 salary levels tested. The advantage is consistent and significant across the income spectrum.
| Salary | Montana | Washington | Difference | Winner |
|---|---|---|---|---|
| $40K | $32,851 | $34,320 | +$1,469 | Washington |
| $50K | $40,519 | $42,355 | +$1,836 | Washington |
| $60K | $48,187 | $50,390 | +$2,204 | Washington |
| $75K | $58,783 | $61,538 | +$2,754 | Washington |
| $100K | $75,453 | $79,125 | +$3,673 | Washington |
| $120K | $88,788 | $93,195 | +$4,407 | Washington |
| $150K | $108,242 | $113,751 | +$5,509 | Washington |
| $200K | $141,542 | $148,887 | +$7,345 | Washington |
| $250K | $174,083 | $183,264 | +$9,181 | Washington |
| $300K | $204,311 | $215,329 | +$11,018 | Washington |
Take-home pay only tells part of the story. Montana has a cost of living index of 97 while Washington is at 110 (national average = 100).
The cost of living gap is moderate. After adjustment, $100K has purchasing power of $77,786 in Montana vs $71,932 in Washington. However, Montana actually provides better purchasing power despite Washington’s take-home advantage.
For a single earner at $100K filing jointly, take-home becomes $81,038 in Montana and $84,710 in Washington \u2014 a difference of $3,673. The gap remains similar regardless of filing status.
On paper, moving from Montana to Washington would save $3,673/year on a $100K salary, or $18,363 over 5 years. But relocation involves real costs: moving expenses, potentially buying/selling a home, changing jobs, and adjusting to a new community.
The $3,673/year savings is meaningful but probably not enough to justify a move on its own. However, combined with other factors like career growth, lifestyle preferences, or family proximity, it could tip the scale.